Composition for solidifying flue-dust.



*UNITED-STATES m ENE-l F IC SAMUEL WILEORD RAMSEYJANQ GUY WARREN SMITH, or YOUNGSTOWN, oHio, 'ASSIGNORS TO THERAMSEY=SMITH GOMrANY, OFYOUNGSTQWN, 011m, A CORPORATION OF OHIO.

.comrosrrron on somnmxme. BLU -DUST.

Patented Oct. 6, 1908.

Application filed January 9,1908. Serial No. 410,008.

To all whom it may concern: 1 I I Be it known that we, SAMUEL W. RAMSEY and GUY W. SMITH, citizens of the United States, and residents of Youngstown, in the county of Mahoning and State of Ohio, have made certain new and useful 'Im rovements in Corn o sition for solidifying F ue-D'ust, of

which t e following is aspecification.

In the .operation of .blast furnaces, for the reduction-of iron fromits ores, there accumulates in the dust chamber at the bottom of the down-take ipe from the furnace, a considerable quantity of dust, whiclrconsists of small particles of oxid -of. iron, coke and other constituents of the furnace charge, which dust by the force of tlie'blast is carried out of the furnace and is from time to time discharged from the dust chamber by a valve.

' This flue dustcontains from '50 to 60per cent.

of iron. I l

Our mventlon consists in a composition of matter for the conversion of this flue dust, or

any other fine iron ore, into bricks or solid.

. masses which may be treated as lump iron ore for the reduction of the iron contained therein, without beingblown out of thefurnace by the blast.

In carrying out our invention, wetake for.

one hundred pounds of flue dust,'a binder compounded as"follows Lime 1O pounds Slag cement 9 Princes metallic 1 These solid constituents after being finely ground are thoroughly and ur'fiformly mixed with 100 pounds of the flue dust, and a quantity of watersuflicient to make a stiff mortar is then added. The whole is then worked 11 dry and harden. 1

together into a plastic mass which is molde 0 times mix the flue dust,.the lime and cement I together first, and then add the Princes metallic to the water and stir it into a condition'of complete suspension'and solution and then add this liquld to the other ingredient's. When, however,'the composition is to be fully repared for use 'or sale as a'binder before a mixture with the flue dust, the lime,

cement and Princes metallic are mixed.

The lumps, bricks, or blocks, after being dried are then readyto be charged into a furnace like lump iron ore for the reduction and utilization of the iron which they contain.

In order that the exact nature of the ingredients which we use may be understood, we would state that the slag cement which we use contains about per cent. of lime, 31 er cent. of silica, 12 per cent. of alumina and non, and 1 to 2 per cent; of sulfur and magne'sia. As to the Princes metallic, the grade of this which we employ is No. 2, containing sesquioxid of iron 48 per cent, calcium. sulfate 47-per cent., and small quantities of silica and silicate. I

In defining our invention with greater that efforts have heretofore been made to 'consolidate the .flue dust of iron furnaces.

For which purposes clay and liquid glue has been used, but the readily combustible organic character of the glue allows it to quickly burn out and the briquet to disintegrate into powder and'be blown out by the blast. We are also aware that lime has been used in such efforts and that various salts and acids have been used. These for the most parts have acorrosive and objectionable action on the furnace. In our invention theslag cement forms a very desirable binder, but eventhis when calcined allows more. or less disintegration by the'driving off of the Water of crystallization, but when the Princes metallic. (sesquioxid ofiiron and calcium sulfate) is also incorporated wefind that it maintains the solidity and integrity fJthe lumps or bricks under a high heat until a proper reduction of the iron is secured. a

We claim 1. A composition 'for solidifying flue dust and. fine iron ore, consisting of lime, hy-

drauliocement and sesquioxid of iron in or about the proportions named.

'2. A composition for solidifying'flue dust and fine iron ore, said. composition containlime, hydraulic cement, sesquioxid of iron and calcium sulfate, in or about the proportions named. l I

3-. A composition for solidifying flue dust end fine iron ere, said .com ositicn conteincorporated together and solidified by means 1ng'l1me,s1ag cement and ruices metalhc. of Water-and then dned.

inor about the pro ortions named. SAMUEL VVILFORD RAMSEY. I 4. As a new artic e of manufacture, a con- GUY WARREN SMllH.

.5 lomer-ate' brick, composed of flue dust, vWitnesses:

lime, hydraulic cement and sesquioxid of EDW. W. BYRN,

,iron-in .01 about the proportions named in SOLON C. KEMON. 

